This module discusses techniques for overcoming some of the inherent limitations of the HTTP protocol. In particular, you will learn:

1. How to use the state-machine model to keep track of users
2. How to pass data from page to page using hidden fields
3. How to use Perl variables in an HTML file
4. How to use HTTP cookies

In the process, you will build and experiment with the first part of our class project, the Guestbook program.
When you are finished with this module you will have a good understanding of the state-machine model and how to use it to make your programs more interactive for your users.